A Novel Direct-Drive Permanent Magnet Synchronous Motor with Toroidal Windings

• Main Authors: Caixia Gao, Mengzhen Gao, Jikai Si, Yihua Hu, Chun Gan
• Format: Article
• Language: English
• Published: MDPI AG 2019-01-01
• Series: Energies
• Subjects: toroidal windings; permanent magnet synchronous motor; finite-element model; motor characteristics
• Online Access: https://www.mdpi.com/1996-1073/12/3/432

A direct-drive motor has the merits of low speed, high torque, and elimination of mechanical deceleration mechanisms, and is widely used in various fields. A novel direct-drive permanent magnet synchronous motor is presented herein, in which all coils are wrapped around the stator yoke in the same orientation. The structure of the novel direct-drive permanent magnet synchronous motor with toroidal windings (N-TWDDPMSM) is introduced and its operating principle is analyzed by describing the variation in the armature magnet field versus time. Furthermore, based on the same power grade and mechanical size, several finite-element models of motors with different windings are established using Magnet software to analyze the distribution of magnetic field, back-electromotive force (back-EMF), power-angle characteristics, loss characteristics, etc. Compared with the traditional permanent magnet synchronous motor (T-PMSM), the traditional permanent magnet synchronous motor with toroidal windings (T-TWPMSM), and the N-TWDDPMSM, the N-TWDDPMSM shows advantages of low speed and high torque, and the feasibility and superiority of the N-TWDDPMSM are verified.